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[pin-eyt, -it] /ˈpɪn eɪt, -ɪt/
resembling a feather, as in construction or arrangement; having parts arranged on each side of a common axis:
a pinnate branch; pinnate trees.
Botany. (of a leaf) having leaflets or primary divisions arranged on each side of a common stalk.
Often, pinnated [pin-ey-tid] /ˈpɪn eɪ tɪd/ (Show IPA).
Origin of pinnate
First recorded in 1695-1705, pinnate is from the Latin word pinnātus feathered, winged. See pinna, -ate1
Related forms
pinnately, pinnatedly, adverb
multipinnate, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for pinnate


/ˈpɪneɪt; ˈpɪnɪt/
like a feather in appearance
(of compound leaves) having the leaflets growing opposite each other in pairs on either side of the stem
Derived Forms
pinnately, adverb
pinnation, noun
Word Origin
C18: from Latin pinnātus, from pinna feather
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for pinnate

1727, from Latin pinnatus "feathered, winged," from pinna "feather, wing" (see pin (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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pinnate in Science

Having parts or divisions arranged on each side of a common axis in the manner of a feather. Ash, hickory, and walnut trees have pinnate leaves.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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